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Loans Receivable - Loan Origination/Risk Management (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest receivable $ 18,888 $ 14,446          
Number of loan segments | segment 4            
Loans receivable $ 4,666,730 3,767,879          
Allowance for credit losses on loans 73,340   $ 71,501 $ 37,993      
Loans and Leases Receivable, Allowance   36,171     $ 36,518 $ 36,363 $ 35,042
Loans and Leases Receivable, Net Amount $ 4,593,390 $ 3,731,708          
Concentration Risk Percentage Greater than Ten Percent 0 0          
Concentration Risk, Percentage 10.00% 10.00%          
Loans Receivable [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest receivable $ 15,600 $ 10,700          
Commercial Portfolio Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 3,862,650 2,946,233          
Allowance for credit losses on loans 54,733   50,442 20,998      
Loans and Leases Receivable, Allowance   23,933     24,466 25,123 23,711
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 750,557 852,220          
Allowance for credit losses on loans 31,159   29,773 10,391      
Loans and Leases Receivable, Allowance   11,739     12,179 11,993 11,343
Commercial Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 859,338 805,234          
Allowance for credit losses on loans 13,032   10,003 4,964      
Loans and Leases Receivable, Allowance   4,512     4,456 5,066 4,898
Commercial Portfolio Segment [Member] | Non Owner Occupied Commercial Real Estate [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 1,384,973 1,288,779          
Allowance for credit losses on loans 10,542   10,666 5,643      
Loans and Leases Receivable, Allowance   7,682     7,831 8,064 7,470
Commercial Portfolio Segment [Member] | Paycheck Protection Program              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 867,782 0          
Allowance for credit losses on loans $ 0   0 0      
Loans and Leases Receivable, Allowance   0          
Commercial Portfolio Segment [Member] | SBA PPP Loans [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Interest rate (as a percent) 1.00%            
Unamortized net deferred fees $ 22,000            
Loans receivable $ 867,782            
Commercial Portfolio Segment [Member] | SBA PPP Loans [Member] | Minimum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maturity of loans 2 years            
Commercial Portfolio Segment [Member] | SBA PPP Loans [Member] | Maximum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maturity of loans 5 years            
Residential Portfolio Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable $ 131,921 131,660          
Allowance for credit losses on loans 1,825   2,223 2,929      
Loans and Leases Receivable, Allowance   1,458     1,411 1,345 1,203
Real Estate Construction and Land Development              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 315,122 274,646          
Allowance for credit losses on loans 9,291   9,124 9,729      
Loans and Leases Receivable, Allowance   3,060     2,630 2,531 2,194
Real Estate Construction and Land Development | One-to-four Family Real Estate Construction              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 99,650 104,296          
Allowance for credit losses on loans 664   567 884      
Loans and Leases Receivable, Allowance   1,455     1,341 1,471 1,240
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 215,472 170,350          
Allowance for credit losses on loans 8,627   8,557 8,845      
Loans and Leases Receivable, Allowance   1,605     1,289 1,060 954
Consumer Portfolio Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable 357,037 415,340          
Allowance for credit losses on loans $ 7,491   $ 9,712 $ 4,337      
Loans and Leases Receivable, Allowance   $ 6,821     $ 6,787 $ 6,540 $ 6,581